Automatic switching system



A. BARNAY July 24,1928. 1,678,318

AUTOMATIC SWITCHING SYSTEM Filed April 28, 1925 9 Sheets-Sheet 1 July 24, 1928.

A. BARNAY AUTOMATIC SWITCHING SYSTEM Filed April 28, 1925 6) R 3 R i 9 Sheets-Sheet 2 July 24, 1928. 1,678,318

' A. BARNAY AUTOMATIC SWITCHING SYSTEM Filed AprilZB, 1925 Q'SheetS-Sheet 3 July 24, 1928. 1,678,318 A. BARNAY AUTOMATIC SWITCHING szs'mm Filed April 28, 1925 9 Sheets-Sheet 4 (m 62 6.96 I 9::{

1,678,318 A. BARNAY AUTOMATIC SWITCHING SYS TEM July 24, 1928.

Filed Apyil28, 1925 7 9 Sheets-Sheet 5 July 24, 1928; 1,678,318 A. BARNAY AUTO IATIC SWITCHING SYSTEM FnedA ru 28, 1925 9 Sheets-Sheet 6 July 24, 1928. 1,678,318

A. BARNAY AUTOMATIC SWITCHING SYSTEM Filed April 28, l925 t 7 July 24, 1928. 1,678,318

A. BARNAY AUTOMATIC SWITCHING SYSTEM Filed April 28, 1925 9 Sheets-Sheet 8 Ear/70y July 24, 1928. 1,678,318

A. BARNAY AUTOMATIC SWITCHING SYSTEM I Filed April 28, 1925 9 Sheets-Sheet 9 Inreflfar b v Q fia/way fla a! F a W .as J's-economically practical.

Patented July 24, 1928.

UNITED STATES PATENTOFFICE.

ANTOINE BARNAY, on PARIS, FRANCE.

AUTOMATIC SWITCHING SYSTEM.

Application filed. April 28, 1925, Serial No. "26,507, and in France April 29, 1924.

r In the automatic switching, system .de-

scribed in my U. S. patent No. 1,556,474, the impulses are received in'each selector (or gnoups of associated selectors) bya small I switch having very little inertia, called the control switch, the condition of the control switch, at the endof the series of impulses determining the position of the principal or connecting switch. It is clear that the connecting switch must have foundan idle line in the selected group of lines before the sucsee-ding series of impulses is sent in, and for this reason, it is necessary to reduce as much as possible the time of operation of the connecting switch. a

7 One of the most important characteristics of the system described in Patent No. 1,556,- 474, is the arrzurgiement by which the time of rotation is decreased, thus permitting the useof a single. motion connecting switch, having access to as large a number of lines Tls important arrangement. is obtained by the use of several connecting means in the connecting switch, one or the other of the connecting means being automatically inserted in the talking circuit by a secondary ching system, the position of which is determined .the tin-a1 conditions in the control switch. This latter, therefore, deter mines the angular position of the wipers of ,c e connecting switch and, at the same time, which series of connecting means, or more exactly which of wipe-rs are to be used for.

the connection.

The object of the present invention is to construct a system in which the connecting -%'\Vil1Cl'l1i-S of thee-no motion type comprising a number of simpleswitcrlies of similar con sti -notion, each with its series of contacts and wipers, so that in the expansion of the syselectrician and making available for this purpose well known and standard relays and other apparatus.

Another of the objects of the invention is the provision otacontrolswitch consisting of several elementaryswitches, each receiving di-ller-ent numbers ing a series of impulses, and all of the ele-, mentary switches being actuated by represented in Figs. 2, 3 and l of the said application.

2, 3, 4, 5, and 6 are diagrammatic representations of the. system circuits utilizof connecting mechanisms. I

Figs. 7,. 8, 9 and 10.;are diagrammatic representations of difierent arrangements of a system particularly adapted to a line'selector which in. general requires two series of impulses, one'for the tens and the other the units digits.

In a general way and in the arrangement as hown in Fig. 1, the main connecting switch K consists of a connecting mechanisms, one or the other of these mechaiiism-s .belnginserted into the connecting circuit, according to whether the dlgit received by the control switch is a multiple of n, oi n+1 of n+2 etc. p

The n connect ng mechanisms are operated bythe same driving mechanism and the choice of a determined connecting mechanism is made by the operation of appropri ate relays, operated by the final positionof the control switch.

In the example as shown in Fig.1, the

main connecting switch K of a hundreds selector, for example, consists of tour connecting, mechanisms, 7 each having a series of wipers 604:, 605, 606 and 607 respectively and a control wiper '125. These wipers are driven step by step by the driving magnet 115 and the relays 90 and. 90 controlthe connectionof one of the four series of wipers v into the connecting circuit.

Whenwiper 100 of the controlswitch C, reaches the position corresponding to the re: ceived digit, as it is explained for the hundreds selector, Fig. 2, in my patent No.

1,556,474 four. differentcases may exist (a) The received digit is multipleof V 4I+1, for Example '5.

A stopping circuit. for the magnet 115 is then closed by: battery, relay .84, wiper 125,

firstcontrol contact of the called group (this group being, represented by the same control contacts as for the called groups in the three following cases) control collector 602,'control Wiper 100 on its sixth contact, and ground at 75. ltelay 84 energizes and opens at 89 the circuit of magnet 115. Neither relay 90 nor 90 is energized and the calling line is connected to wiper 604 by contacts 95 and 609. .The selection of an idle line in the called group is made as described for the hundreds selector, in my patent No.1,556,474.

4+2, for Example 6.

The circuit of stop relay 84 is closed as in the preceding case, but this time, the control wiper 100 is on the seventh contact of its bank and the stop circuit includes the upper winding of relay which energizes and closes at contact 93 its holding circuit. The calling line is connected to wiper 605 by contacts 94 and 611.

(o) The received digit is a multiple of 4+3, 7'for example. a I

In this case, the stop circuit is closediby' the control wiper on the eighth contact of its bank and the-upper winding of relay 90 in series with relay 84. Relay 90 on energizing, connects the calling line by contacts 95 and 608 to wiper 606, and closes its holding circuit at 93.

(d) The received digit is a multiple of 4; 8 for example.

Control wiper comes to rest on the 9th contact and the circuit of relay 84 is closed in'series with the upper windings of-relays 90 and 90 in multiple. The energization of the two relays 90 and 90, simultaneously, connects the calling line to the wiper 607 by conta-ts 94 and 610. Relay 77 by its contacts 79 and 79 short-circuits relays 90 and 90, to-prevent the operation of these relays while the wipers are rotating.

In the example as shown in -Fig. 2, and

in a general way, the main connecting switch K consists of 7% connecting mechanisms,

driven by the same driving mechanism. The choice of one of the n connectingmechanisms being made directly by the control switch. which is equipped with contacts for connecting the calling line to any one of the n connecting mechanisms.

Fig. 2 represents a main connectingswitch 01 a hundreds selector, for example, having four connecting mechanisms, each consisting of a series of wipers'633, 634, 635 and 636, mounted on the same shaft and driven by the rotary magnet The setting of the control switch C, according to-the received digit,-and the stopping of the wipers of the main connecting switch K, on the first line in the group of called lines takes place as it is described for the switch shown in Fig. 2 of my Patent No.1,556,474. I

According to whether the received digit is a multiple of 4+1, 4+2, 4+3, or is a mul- The received digit is a multiple of choice 01 one of the a connecting mechanisms is obtainedby establishing a 'ClI'Clllt.

romprisin'g acontrol contact of the chosen mechanism and the contact in the bank of the control switch corresponding to-the receiveddigitr I Inthe'application represented in Fig. 3, the main connecting switch K consists of three connecting mechanisms havingeach a series of connecting wipers and contacts, 618, 619 and 620, and a series of controlwipers and contacts 615, 616, 617. These-series of wipers" are' mounted on the same shaft and are driven by the rotary magnet 115. I

The setting of the control switch C takes place as deseribed 'in my Patent No. 1,556,474.

According .to'whether the received digit is a J7 multiple of 3+ 1, 3+2, or is'a' multipleof 3,

the stop circuit" is closed through control wiper-.100 of control switch C'and one of the relays 621,622 or 623 in'series with one of the wipers 615, 616 or 617 and one of the controlconductorssuch as 612, 613, or 614.

The stop relays 621, 622 or 623 opens the circuit of rotary magnet 1 15 at contacts 627,

628 orv 629' andconnects' the line to wipers 618, 619 or 620 respectively by the contacts 630, 631 or 632. When an idle line in the called group is selected, relay 61 energizes andcloses the hold'ing circuit of relay 621,

or 623 (already energized as explained 7 above) by one of the'contacts 624,625 vor626,

contact 64 and ground.

Tn Fig4, the main-connecting switch k, consists of n connecting mechanisms, each llu of which may have access to all or to a part Of the outgoing line of the switch, the n connecting mechanisms testing simultaneously a lines of a group and the mechanism inserted into the connecting circuit be ing the one which is the'first to find an idle line in the called group oflines.

The fn" connecting mechanisms may or .may not be mounted on the same shaft and driven by the samedriving mechanism only one series'otcontrol contacts being necessary in" case there is a common driving mecha 'nism, the choice of. the connecting mechanism being determined by the operation of the corresponding test relay which occurs as soon the connectingmechanism, associated with tlietest relay, is driven on toan idle line, amongst the idle lines with whichfthc a connecting mechanisms are in contact. If several of the connecting mechanisms are in contact with idle lines, only the first-one will connect up the calling line.

The main connecting switch K, in the application represented,consists of three con-- nccting mechanisms each one having a test' wiper and associated contacts 640, 641 and 1642 and line wiper and contacts 643, 644 and 645. They are mounted onthe same shaft as the control wiper 125 and are driven by the rotary magnet 115; I

The setting of the wiper 100 of the control switch C takes place as described in my Patent No. 1,556,474. lVhen the wipers 125, 640 to 645 inclusive are brought into con-tact with the contacts of the first line in by step the wipers 125, .640, 641, 642, 643,

644 and 645. As long as the wipers are on the contacts otbusy lines, the test wipers 640, 641, 642 do not find battery potential and the test relays 652, 653, 654, cannot energize'one side of their upper winding being grounded at 649, 650, 651 and 75,-and the other being connected to test wipers 640, 641 and 642. The rotary movement continues [until one of the test wipers finds an idle line which is indicated by battery potential on the test contact such as the line connected to contact 648 associated with test wiper 642.. v Q i Y Relays 165,4 energizes in series with theresistance connected to conductor 648 and opens at 660 the circuit ofmagnet 115 and the wipe-rs come to rest. Ground is kept on the test conductor/ to the preceding switches at 665 and at 668 the calling line is connected towiper 645 at 669, thecircuit ot the line relay (not represented see the Patent No. 1,556,474, Fig. 2) is opened and when relay 68 falls back, the holding circuit of relay 654 is closed by ground sent back over the test conductor by the following switch. 6 i In a similar manner, relay 652 or 653 energizes ii the first idle line is found by wiper 640 or 641.. p If two or three idle lines are found simultaneously two or three test relays energize, for exainplelthe three relays 652, 653nnd 654, but relay 652 opens at contact 665 the circuit oi. the line to wipers644 and 645and wiper 643 is the only one connected'a-nd ground being placed only on test wiper 640 by the following switch, via conductor 646 corres DODdlH to line wioer 643 rela 653 l b l y and 654 all back, when relay 68 restores.

In Fig. 5, the main connecting switch is,

consists of p a connecting mechanisms. ,7

These p a connectingmechanisms-;may be driven by P driving mechanisms. The operation of a given driving mechanism being determined when the control switch is set,

bythe impulses over the callingline, on contacts corresponding to groups of lines cozinected. to the banks of one of the ,n connecting mechanisn'is driven by thedetermined driving mechanism, these organs therefore operate successively. l

The a connecting mechanisms. driven by the same driving mechanism may be combined in any one of the ways represented in Figures 1, 2, 3 or 4 or infa Way which is a resultant of several of these figures in, order to reduce the displacement in attaining a group of called lines and for exploring the lines 1n called group. v

in Fig. 5, the main connecting switchK consists oi" 6 connecting inechanisms w afi 1 3) driven. bythree rotary magnets 710,

7l2.and 714. Eacl'rma net drives two connecting mechanisms represented in- Fig. 5

by the series oi contacts 702, 703, 705,706,

708, 709. Two connecting mechanisms such as 702, a, 705-706Q708-709 are mounted on the same shaft with a control wiper 701,

clay 67 6 connects the line circuit, either of 702 to 703, 705 to 706, 708 to 700, by its contacts 678679, 630681, 682683. This relay operates like relays and 00' .in v al- 7 Y hen the control switch leaves its normal position, itswiper 670, on passing over con-- tacts 2, 3, 4- and 5, connectsground via contacts 675, 690 and 71 1 tomagnet 710wh1ch operates and advances the w pers? 01 702,

703. 7 When wiper 670 reaches the sixth contact of its bank, i. c. has passed the four contacts corresponding to the groups ozt lines connected to thebanlccontacts of-wipers 702 and. 703, the circuit of ina net 712 is closed via contact 67 5, wiper 670, and contacts 691 and 713. lllagnet 712 operates and advances the wipers 704 v110 706 inclusive.

Finally, when wiper 670 has passed the contacts of its ,banl corresponding to the groups of lines connected to the banks of its holding circuit is closed by contact 687, 688 or 689, and ground by a contact of relay 61. I

The relay 684, 685 or 686, which energizes and definitely stops its wipers, is the one which is connected to the one of the control wipers 701, 704 or 707, which is connected by one of the conductors 696 to 700' inclusive to the bank contact of the control switch on which the wiper 100 is stopped.

Relays 684, 685 and 686 close respectively the calling line by 693,679 and 678 on to the wipers 702, 703 by 694, 681 and 680, onto wipers 705, 706 and by 695, 683 and 682 on to wipers 708, 709.

I In'Fig. 6, the main connecting switch consists of n P connecting mechanisms op' erated by 1) driving mechanisms.

The p.dr1v1ng mechanisms are operated simultaneously and the connecting mechanism inserted into the connecting circuit is determined in the position of the controt switch.

- The n connecting mechanisms operated by the same driving mechanisms may be combined in any one of the ways represented in Figs. 1, 2, 3, or 4 or in a way whichis a resultant of several of these figures. In F1 6 the main connecting switch consists of three connecting mechanisms (U/:1, p='3) operated respectively by the magnets I 725, 727 and 729, the connecting mechanisms being represented by one line, wipers and contacts 720, 722, 724 and one control wiper and control. contacts 719, 721 and 723.

The contacts of control switch C are con.- nect-ed by conductors such as 716, 717 and 718 partially to the control contacts 719,

partially to control contacts 721 and partially to control contacts 723. Wiper 100 of the control switch is set by the impulses of the calling station as described in my Patent No. 1,556,474.

The operating circuits of magnets 725,, .727, 729 are respectively closed as soon as the control switch leaves its normal position by 64, 106, 70, 737, 738, 739 and 726; '64,

10c, 70, 737, 738, 739 and 728; ca, 106, 70,

737, 738, 739 and 730.

Magnets 725, 727- and 729, on operating advance simultaneously their wipers'719 to y 724 inclusive. The circuits of these magnets may beopened by any one of the relays 731,

732, 733 at contacts 737, 738, 739.

The energization of one of these relays stops simultaneously the connecting mechanisms making up switch.

The relays 731, 732 and 733 are connected respectively in the circuit of control wipers 719, 721 and 723, one of which is connected to ground by one of the control conductors, such as'716, 717, 718, connected to the bank contact of the control switch on whichwiper the I main connecting 100 is stopped, i. e. on the contact corre of the control contacts in sponding to the digit sent in by the calling station.

The relays 731, 732 or 733, the circuit of which is closed, connects by 740, 741 or 742,.

the control switch consists of 92 associated elementaryswitches, each receiving a series of impulses and being actuated by a single rotary mechanism. As soon as the first series of impulses, received by the control switch, has directed the connecting switch to the first line in the group of lines'corresponding to the first digit, the control switch is brought to normal position and may then receive a second series of 1111- pulses, then a third, etc. g

The circuit represented in Figs. 7, 8, 9 and 10, is relative to an application of this ar rangement, particularly appropriate to a line selector which generally requires two series, of impulses, one for the ten digits, the other for-the units digits. j

A smallcapacity system, not requiring group selectors, has been takenas an examplein order to'make clear the very interesting features of the invention, and in which not only local connections are possible, but also; connections with other otfices either manual or "automatic. The trunk lines to these ofiices may be reached by calling either a one or two digit number and the connecting switch choosing automatically an idle line in the group, the group of lines being, determined by an appropriate wiring connecting switch. I Suppose that the station P would like to call the station P the number of which is WVhen thereceiver is taken down at the calling station P, relay 1 energizes as described in the Patent No. 1,556,474 (Fig. 2 relay-1). Relay 4 energizes in the circuit: battery, lower winding of 4, contacts 8, 7, 6, 5, 9, 3 and earth. At 12 and 13, earth is connected to relays 18 and 19, and at 10 to rotary magnet 20. Thefinder operates as described in the Patent'No. 1,556,474, and when relay 18 energizes, the calling line is connected to relay '27 in the control switch at 21-22, 23-24., 2526. v

f Relay 27, which has one of its windings connected to battery and the other to an earth on which is superposed the dialling the bank of the I tone, energizes in series with the calling line and station, and closes at 28 the circuit of 29, which on energizing closes the holding circuit of 4 by 30, common conductor 31, 11 and the upper winding of 4. This relay being slow to release does not fall back during the interval of time that elapses between theopening oft) and the closure of 30. At the starting conductor is connected to a group of finders] and line selectors associated with another control switch.

hen the calling subscriber operates his calling device for the first digit of the wanted number, the digit 3 inthis case, relay 27 sends three impulses to the magnet 33 which lay 42 and battery. Relay42 energizes be fore the magnet 138 has the time to operate and opens at 38 the circuitof 138. Relay 42 remains energized until wiper 34 leaves the third bank contact, at which time it falls back and closes the circuit of 138, which operates and advances the nipers43 to 52 inclusive; Atthe end of the -tenth step of 138, wiper 43 is in engagement with a contact earthed by wiper 34and 42 energizes again and opens thecircuit'of 138."

During the series of impulses, relay 53' energizes in series with magnet 35, and being slow to release, remains in operated position. An instant after the impulses cease, 53 falls back and when 42 ,is energized the second time with 53 in normal'position, a new circuit for 53 is closed by: earth, contacts 30, 54, 139, '59, relay 60, contacts 37, 61 magnet 33, battery. Magnet 33 drives its wipers to normal position. In this position, 36 and 37 operate and open the circuit of 33, and the wipers come to rest. During the operation of 33, slow to release relay energizes and closesat'62 the circuit: earth, 36, 62, relay- 42, battery. \Vhen36 is opened, 42 Falls back followed an instant after by 60. During this instant the circuitof relay 64 closed by: earth,. 30, 54, 58, '63,relay 64, battery. Relay 64 closes its holding circuit at 6'3, and at 66 connects earth to the interior row of contacts wiped over by wiper 35.

lVh-en the calling subscriber operates his calling device 'for the "second digit of the \vanted nnmber, the digit? in this case magnet 33 receives oneimpulse and advances its wi'pers'on-e step. The circuits of magnet 138 and relay 42 are again closed as described above and the magnet 138 does not operate, since the control wiper .43 is in engagement with the contact earthed by wiper 35 (see patent application 653,568).

When relay 53 falls back, the circuit of 68 isclosed by earth contacts 30, 54, 139, 140, relay 600, contact 71, resistance 72, battery. The relays 75 and 74 are connected in series by the circuit: earth, contact 10, relay 74, contact 17, common conductor 7 5, corn tacts 78, 69, common conductor 76, contacts 16, 79, relay 73, battery. At the same time at 7 0,:test wiper 47 is connected: to a point between relays'73 and 74 in the above circuit, over the circuit :common conductor 77, con-- tacts 15, 81, test wiper 47. i

If the called line is engaged, there is earth in series with a low resistance, such as relays I 18 and19, or the loWerwind-ing of relay 74 on the test contact and relay 74 beingsh'nnted by this earth doesnot energize, but relay 73 energizes, at and 26 disconnects the calling line from relay 27, and connects it at 141-and 142 to relay 82. Relay 82 on energizing in series with the station P, opens at 79 the energizing circuit 01 73 and at the same time closes at 143 a holding circuit for this relay, i

l/Vhen the circuit of 27 is' opened, this relay on falling back opens the circuit of 29, which on restoring causes the release of the control switch as will be describedfurther on, and

opens at 30 the holding circuit of relay 4 which, on restoring, disconnects the line solector from the control switch which may now be used for another connection. 1 In the line selector relays 82 and 73 energized and the engagedtone is sent over the circuit: battery, left winding of the transformer 101, 85, condenser 86, 141, calling line and station P, 142, upper-winding of 82 andbattery.

When the calling subscriber hangsup his receiver, the connection is released as will be described further on. If the called line is idle, the test wiper finds battery on the test contact inseries with theright winding of low resistance of relay 102,74 energizes and short-circuits at 80 its upper windingof high resistance; under the action of its lower resistance wind ing 74 operates all of its contacts, 102 energizes with thelow'resistance winding of 74 and at 104 removes thefshort-circuit from its high resistance winding in order to busy the line to other calls, 74rem'ains energized" in series with the two windings of relay 102. c On the other hand, earth in series with 74 energizes 73 which being'slow acting,

operates its contacts after the energization are i are energized and the called line is connected to the ringing generator by. 90 and 92, the operation of the ring cut 011' relay 107 and battery feed relay 111 takes place as described in the Patent No. 1,556 474.

At the end of the conversation, when the calling party, hangs up his receiver, 82 falls back and opens the circuit of 73 which, on fallingback, removes earth from 107, 74 and 18, which falls back. At 88 another circuit for 107 is closed by! earth, 111, 83?, 98, 112, upper winding of 107 and battery. Relay 107 closes the circuit of magnet'138 in parallel with its upper winding by the contacts 95, 94 and 41. Magnet 138 drives the wipers to normal position. At normal position, the circuit of 138 is opened at 98,

107 remains in operated position during the operation-of magnet138, and switches the start conductor to the next line selector. In"

normal position 98 is opened and 107falls back. The. selectonis. now'free to receive another call. i

- In the control switch, when 29 falls back, earth is removed from 30, and relays 64'and 68 fall back. At 146, the circuit of magnet 3.3 isclosed by earth, 147, 53, 146, 37, 61, magnet and battery. Magnet 83 operates and drives the wipers to normal position. In :normal position, the circuit of 33 is opened. at 37. Relay 53 energizes in series with magnet 38 and by 148 and 118 the start: ing conductor is switched to another group of finders and line selectors associatedwith another, control switch... .An instant after the contact 37 is opened, relay 53..falls' back and the control switch may be used for extending another call. 7

Suppose now that the call is for'another oflice, the call number. of'whieh is 57. and,

that there are three trunk linesleading'to the ofiice.

fWhen the calling subscriber ta'kes down hlS receiver his line is connected by a finder switch to a line selector as described in the preceeding case, and the control switch operates 1n the same manner.

After the first digit 5 is called, wipers;

84 and 35 are engaged with the 6th series otbank contacts, and when relay 53 ;falls back, the circuit of 115 is closed by earth, 149, 6th contacts short-circuited by wiper 34, contacts 57, 118, relay 115 andbattery. Relay 1 15 closes at150 itsholding circuit to earth .by 30. 7 p

lVhen the wiper 43 of the line selector is brought to rest on the control contact earthed by wiper 84, the control switch drives its wipers to normal position and connects earth to wipers 35 as hereinbefore de scribed. y

hen the second digit 7 is called, the control switch drives its wipers 34 and 35 into engagement with the 8th series of bank contacts and when 53 falls back and 42 en- 43 of the selector, opens at .45 the energizing circuit of 42, after having established a holding circuit for thisrelay at 119 and finally at 120 connectsthe'upper winding of relay 111 to the test wiper 47 of the line selector.

If the first line of the group ofthree lines is idle, there is battery inseries with a low resistanceqon the test contact. and lllenergizes by :1 earth,;contacts 10, 83, .84, .upper W nding 0fll r9 12 ,1 5, test wiper 47, contact 125, resistance 126 and battery. Relay 111 opens at 44 the. circuit otmagnet 138, before the magnet operates,

. closes at the circuit of its lowerwinding tothe testwiper. in series with the resistance 131; closes at "99 the circuit of 73 andeone 'nects-at 154 and 155 the calling line to the.

wipers 48 and 49,by 91, 9,3, 109and'110,

Relay 128 energizes in series with the calling line and station, and closes at132 the circuit of 127-. Re1ay.127 replaces at [125 the battery on the test conductor byearth,

which holds relay 1110f the line selector in operated position by the circuit: earth, 125, test wiper 47, contacts 81,100,,resistance 131, lower winding ,of 119 andbattery. At contact 99, relay 111 establishes another circuit for relay 7 5 by: earth, contacts 144 (when relay 4 falls back) 157, 96, 99, relay 73 and battery I g Relay 128 closes a bridge across the'out going 'trunlrline at 133,111 series with the impedance coil 134, in order to give a calling signal in the distant oifice.

' At the end of the conversation, when the calling party hangs up his receiver, 128falls back, tollowedby 127, which removes at 125 earth fronrthe test conductor. Relay 111 in the selector restores and opens at 99 the cir cuit of 73. When 73ifalls back, the selector releases as described in the preceding'case.

'[f the first line is engaged, there is no battery on the test conductor; relay 111 cannot energize and. magnet 138, operatesin I the circuit: battery, 132, 41, 18, common conductor 40 -152, common conductor 46 and earth, 14, 44, wiper 43, 8th control conduc-.

tor 158. Magnet 188.,drives the wipers on "to the contacts of the nest line, and if it is idle, relaylll energizes and opens the circuit o't138 at 44. If this line is also engaged, relay 111 cannot energize and the magnet continues to operate and drives the wipers on to the contacts of the 3rd line. If the third and last line, of the group is engaged, relay 111 will not be energized, and as the 9th unit control conductor is not earthed, relay 68 energizes in series with magnet 138 over the circuit earth-contacts 30,34, 130, 1 10, relay 68, contacts 151, 152, common conductor 40, contacts 18, 41 magnet 138 and battery. On account of the high resistance of 68, 138, does not operate. Relay 6S closes at and the circuit of by: earth on the test conductor of the 3rd line, test wiper 47, contacts 81, 15, common conductor 77, contacts 70 and 60, common conductor 76, contacts l6 and 7 9, relay73 and battery.

The. energization of only relay 73 in the line selector effects the release of the control switch, and causes the engaged tone to be sent to the callingsubsoriber as it was described in the case of a local connection. Vi hen the calling subscriber hangs up his receiver, the release of the collector takes place as it has already been described;

Since the control switch is common to a certain number of line selector, it is quite important that it should not occupied by false, calls. lVith this in view, relay 137 and the two interruptors 185 and 136 are provided. hen the control switch is taken into use, when relay 29 energizes, a circuit for 137 is prepared by: earth, 30, 34,' relay 137 122, common conduct-orv and interrupter The interrupter 135 closes its contacts every. 1Q-seconds latter the control switch has not received any impulses (that which causes the energization of relay 53 and the de-energization of 137) when the interrupter closes its contact again, the circuit of relay 75 in the selector is closed by: earth-interrupter 136, contacts 121, 76, 16, 79, relay 73, and battery. Relay 78 effects the release of the control switch and causes the engaged tone to be-scnt out on the calling line.

' lVhat I claim as my invention and desire to secure by Letters Patent is: v

.1. in an autoi'natic telephone system, a calling line, a called line, an electrical impulse sender, an impulse receiving organ having two separate series of contacts, a single motion connecting mechanism for connectingcalling and called lines, the said mechaniuu having a plurality of series of contacts and corresponding sets of wipers constituting a plurality of similar rotary switches commonly driven, means for deternining the setting of the said wipersby the state of the first series of contacts of the impulse receiving organ, the calling line being connected to a given set of wipers by the second series of contacts of the impulse receiving organ. 7

2. In an automatic telephone system such 1 as claimed in claim 1,. an impulse receiving organ consisting of a rotary switch having several rows of contacts and an equal number of wipers, the callingline being connected to one of the sets of Wipers. of the connecting mechanism one of the series of cont-acts and its associated. wiper, of; the rotary switch.

3.111 an automatic telephone system, a calling line, acalal'ed line, an electrical impulse sender, an impulse receivingorgan having contacts, a single motion connecting mechani m :for connecting calling and: called lines, the said mechanism having a certain number of series of connecting and central contacts, connecting and control wipers-moving together constituting a plurality of Sl'll'llw lar rotary switches commonly driven, each erated by step relays, eaclrof the saidstopq V relays being connected to an; associated con trol wiper; contacts for connecting the calling line to the connecting wipers, the said contacts being operated by the stop relays 1'. In an automatic telephone system, such as claimed in claim 3, a holding circuit for each stop relay and means for'renderi-ngthis: circuit inoperative until the wipers; of the connecting mechanism are definitively set.

5. In an automatic telephone system. such as claimed in claim 8, a holding circuit for each stop relay, a contact in series with the said circuit, a test relay'tor operating the said, contact, means for operati-ngthe said test relay when the wipers of the connecting mechanism are definitively set. s

.6. In an automatic telephone systemQa calling line, groups of called lines, an electrieal impulse sender, an impulse receiving organ, a single motion connecting mechanism constituted by a plurality of like-type switches commonly driven for connecting the calling line to a line in the called group, the said mechanism having a certain number of series of connectingand test contacts and sets of corresponding connecting and test wiper means by which a first setting. of the wipers of the connecting mechanism is de termined by the state of the impulse recci-ving organ, the lines incach 'calledngroup' being connected to successive and corresponding connecting and test contacts of the series of contacts, a free hunting circuit for the, connecting mechanism, a plurality of contacts in series in the said circuit, test relays for operating the said contacts, each in the called group.

7. In an automatic telephone system such as claimed in claim 6, means for neutralizing the effects of the 'energization. or" a test relay when a precedingtest relay is energized.

8. In an automatic telephone system such as claimed in claim 6, contacts in series with the calling line, each contact operated by a test relay for connecting the calling line to a set of wipers corresponding to an idleline 9. In an automatic telephone system gzuch as claimed in claim 6,'switching arrangements having working and resting contacts, these latter contacts bein arranged in series with the'succeeding switching arrangement,

the working contacts being each connected respectively to a set ofwipers, each switching arrangen'ient being operated by a test relay. a I

10."In an automatic telephone system, a calling line, a called line, an electrical impulse sender, an impulse receiving organ, a single motion connecting mechanism-for con necting calling and called lines, the said mechanism-1having several groups of contacts and associated wipers and a certain number 0i driving mechanisms, each operating certain sets 01 wipers, means for deter mining the setting of certain sets of wipers by the state of the impulse receiving organ and means for inserting certain sets of wipers in the connecting circuit according tothestate of the impulse receiving organ. 11. In an automatic telephone system such as claimed in claim 10, means for operating successively the driving mechaniimsz 12. In an automatic telephone system such as claimed in claim 10, an impulse receiving organ having-a supplementary series of contacts, a controlling circuit for each of the driving mechanisms including certain'o't the said supplementary contacts in order that a certain determined controlling circuit nay be closed by certain positions of the impulse receiving organ. I r

13. In an automatic telephone system such as claimed in claim 10, an impulse receivingorgan consisting of a rotary control switch having two series of contacts and two sets of wipers; in the connecting mechanism aseries of control contacts for each of the driving mechanisms connected to certain-contacts in one of the said series of contacts of the corn trol switch, the controlling circuit of the said driving mechanisms including contacts of the second series of contacts of the control switch.

14. i In an automatic telephone system such as claimed in claim 10, several series of contacts and associated wipers in a group corresponding to a driving mechanism, means for inserting in the connecting circuit a determined series of contacts and itsas'ociated wiper according to the state otthe impulse receiving organ.

7 15. In an automatictelephone system such as claimed in claim 1O,'a-cont1f-ol1ing circuit for-each of the driving mechanisms, an interrupter in series with each of these circuits, a stop relay for operating each of these interrupters when the wipers areset on the calledline, contacts placed on the calling line and operated by a corresponding stop relay for connecting the said line to a group of wipers or the connecting mechanism.

16. In an automatic telephone system such as claimed'in claim 10, several seriesof contact); and associated wipers in a group corresponding to a driving mechanism; certain groups having the same number of series of contacts and wipers; switching contacts 'arranged in the, circuit of the calling line for connecting the said line to one or the other a of a ser esofa group and means ior' operat ig simultaneously the said contacts.

In anautomatic telephone system such as claimed inclaim 10, means for operating simultaneously the different driving mech-' anisms. I I 7 I 18, In an automatic telephone system such as claimed in elaim 10, only one controlling circuit tor the driving mechanism a num-/ ber of interrupters equal'tothe number of driving mechanisms in series \Vltll the said circuit, a stop relay for each of the said interruptersand means for energizing a de termined stop relay according to the state of the impulse receiving organ. a I I 19. In an automatic telephone-system, a

calling line, a called line, an electrical im-- pulse render, an impulse receiving organ having several series of contacts, each series corresponding to a series of impulses and operating means common to the several se-@ to certain of the series of contacts of the ime pulse receiving organ, an operating circuit for the connecting mechanism, an inter-' rupter in series with the said circuit and "operated by a stop relay connected to the control wiper, means for switching the circuit of the stop relay successively on to the several series of contacts of theimpulse receiving organ, between each series of impulses.

21. In an automatic telephone system such as claimed in claim 19, an impulse receiving organ consisting of a rotary switch having several associated switching elements, each relative to a different series of impulses and operated by the same driving mechanism.

22. In an automatic telephone system such 'tary switch to normal position after the setting of the wipers of the connecting mechanism at the end of a series of impulses,

23. I11 an automatic telephone system such as claimed in claim 19, an impulse receiving organ consisting of a rotary switch having several rigidly associated switching elements,

each relative to' a different series of impulses and operated by the same driving mechanism, a restoring circuit for the rotary switch including three interrupters in series, means I for closing the first interrupter when the switch leaves its normal position, means for closing the second interrupter between each series of impulses, and'means for closing the third interrupter when the wipers or the connecting mechanism are set in conformity with the series ofimpulses precedingly received.

2 1. In an automatic telephone system, a calling line, a called line, an electrical impulse sender, an impulse receiving organ consisting of a rotary control switch having several rigidly associated switching elements, each relative to a different series of impulses and operated by the same driving mecha nism,a single motion connecting mechanism for connecting calling and called lines, havcuit for the connecting mechanism, means for setting the wipers by successive degrees according to the successive positionsot the impulse receiving organ, astop relay con trolling the said circuit, means for restoring the rotary control switch to normal position after the setting 01 the wipers of the connecting mechanism, corresponding to each received series of impulses, means for switching the circuit of stop relay successively on to the several switching elements, alter the control switch is restored to normal position.

25. In an automatic telephone system such as claimed in claim 2d, a switching device for the stop relay, two interrupters in the control circuit of the said switching device, means for closing one of the said interrupters when the control switch is in normal position'and a slow acting relay included in the restoring circuit of the control switch, operating the other.

26, In an automatic telephone system. such as claimed in claim 19, a test circuit for the called line, an interrupter included inthe said circuit, means for closing the said ining contacts and wipers, an operating cirterrupter at the end of the last series of impulses received by the impulse receiving organ when'the wipers of the connecting mech anism sunset on the contacts of the'called line. I I V 27. In an automatic telephone system as claimedin claim 24:, a test circuit forthe called line, an interrupter included in the said circuit, a relay operating the said intcrruptcr, three interrupters included in the circuit of the said'yrelay, means for closing the first oi"? the said interrupters at the end oi the last series of impulses, means for closing the second ofthe said interrupters when the wipers oi the connecting mechanism are set in conformity "with the last series of impulses and means tor closing the third of the said interrupters when the circuit of the stop relay is switched 011- to the last switch-.

ing element. i p

28. In an automatic telephone system such as claimed in claim 19, a release circuit for the impulse receiving organ, a timing'device controlling the said circuit,'means it'or causing the release of the impulse receiving organ at the end ot a given time, if during this time no impulses are received.

29. In an automatic telephone system such as claimed in claim 19, two periodical synchronous interrupters closing their contacts one after the other, arelease relay for the impulse receivingorgan,the lagging interrupter arranged for closing the circuit of the said relay when the impulse receiving organ is takeninto use, means for guarding the said relay energized until a: series of impulses are TECGlVGCl, another interrupter in series with the leading periodical interrupters and'operated by the energization of the sa d release relay, in order to produce the rclease or the impulse receiving organ by the closure 01 the contact of the leadingpericdical interrupter. Y

80. In anautomatic telephone system, such as claimed in claim 19, two periodical synchronous interrupters closing their contacts one after the other, a release relay for the impulsereceiving organ, the lagging inter,-

rupter arranged for closing the circuit of the said relay when the impulse receiving organ is taken into use, a holding circuit for the said releascrelay,an interrupter included in the said circuit and arranged to he operatedby a slow acting relay inserted in serieswith the impulse circuit, an interrupter in series with the leading periodical interrupter and operated by the energization of the said release relay, in order to produce the release of the impulse receiving organ by the closure of the contact of the leading periodical interrupter.

31. In an automatic telephone system as claimed in claim 19, a relay arranged so as to be energized if the called line 1.8 free, a slow acting relay arranged so as to'be'energized lit) after the definite setting of the Wipers of the connecting mechanism, means for disconnecting the calling line from the impulse receiving organ by the energization of the said slow acting relay and means for giving the busy signal to the calling line when the said slow acting relay is energized alone.

32. In an automatlc telephone system, a

calling line, a group of called lines, an impulse sender, an impulse receiving organ, a single motion connecting mechanism for connecting the calling line to a line in the called group and having contacts and Wipers, means for setting the Wipers on the first line of the called group by successive degrees ac cording to the successive positionsof the impulse receiving organ, contacts arrangedso as to be operated by a call number corresponding to the called group and means by which an idle line in the called group is caused to be selected by the operation of the said contacts. 7

33. In an automatic telephone system such as claimed in claim 32, selecting relays arranged to beienergized by a given call number and equal in number to the digits composing the call number determining their In an automatic telephone systemsuch as claimed in claim 32, selecting relays, a connecting mechanism having connecting Wipers and cont-acts and control Wipers and contacts, means for placing the same potential on all the control contacts of the lines in the called group excepting the last by the energization of the corresponding selecting relay.

86. In an automatic telephone system such 7 as claimed in claim; 32,;an impulse receiving organ having several series of contacts, each relative to a determined series of impulses, a connecting mechanism having connecting contacts and wipers,'control contacts and a control Wiper, a circuit for operating the said connecting mechanism including an interrupter, controlled by a test relay,the last series oflcont-acts of the impulse receiving organ and the control Wiper, in order that the ipers of the connecting mechanism may be driven on to the last line of the, called group. 1 7

37. In an automatic telephone system as claimed in claim 3:2, an impulse receiving or- I gan having several series of contacts each relative toa dete mined series of impulses, a connecting mechan sm having connecting,

test and control contacts; andwipers a test,

relay in the circuit of the test Wipers means for connect ng the call ng lme to the called line, for openingthe battery feed circuits of the calling and called lines and for releasing the impulse receiving organ by the energi zation of the said test relay.

88. In an automatic telephone system as claimed in claim 32, a test circuit for the last ine in the called group, an interrupter in- I eluded in the said circuit, means for closing the said interrupter when the wipers of the connectingmechanism are on the last line of the calledigroup in order-to give the busy signal to thecalling line if the said last line is engaged. I I p t I 89. In an automatic telephone systemsuch as claimed in claim 32, a connecting mecha- 'nism'having a connectingand control contacts and Wipers, atest circuit for thelast line in acalled group, an interrupter in-' cluded in the'said circuit, a relay operating the said inte'rupter, arranged to be Fshort- 1 circuited by the control Wiper until the Wipers of the connecting mechanism are 'driven on tothe last line of the called group.

i In testimony whereof I have signed my I name to this specification.

ror-Nn' BARNAY. f 

